Welcome!

News Feed Item

Integra Gold Reports up to 97.8% Gold Recovery in Phase 3 Metallurgical Testing

VANCOUVER, BRITISH COLUMBIA -- (Marketwired) -- 02/25/14 -- Press release highlights:


--  Gold recovery of up to 97.8% for the Parallel Zone composite samples
    using a combination of gravity and Carbon-in-Leach ("CIL") cyanidation.
--  Test work completed by ALS Metallurgy ("ALS") in Kamloops, British
    Columbia, with supervision by WSP Group ("WSP") from Val-d'Or, Quebec
--  Phase 3 focused on applying recovery processes consistent with existing
    milling infrastructure in the region

Integra Gold Corp. (TSX VENTURE: ICG) ("Integra" or the "Company") is pleased to announce it has completed its Phase 3 metallurgical testing program at its Lamaque Gold Project in Val-d'Or, Quebec. The Phase 3 program was designed to individually assess the metallurgical response of samples from the project's four gold deposits using flowsheets that replicated the processes used by various mills in the immediate vicinity of the Lamaque Project. The Company is currently assessing the viability and availability of each of the mills and will incorporate these results into its future plans.

"Results of this program confirm that gold at the Lamaque Project can be efficiently recovered utilizing the same processing methodologies and flowsheets used in existing milling facilities in the immediate vicinity. We will use this positive metallurgical data to guide the next phase of our development plan, which is to assess all options and determine the best fit for the Company's needs moving forward. The fact that there are six potentially available mills included as part of this study speaks volumes about the infrastructure advantages this project has," commented Company President and CEO, Stephen de Jong. "The recent test work indicates that metallurgical gold recoveries can be optimized to over 95% which is consistent with what was achieved historically on similar types of mineralization at the neighbouring Lamaque and Sigma mines. Further metallurgical work is required for the Plug No. 4 material and we are confident there is significant room for optimization. We do not anticipate this will have a significant impact on our upcoming PEA as the initial phase of proposed production will focus on the Triangle and Parallel Zones."

The following table give a summary of Phase 3 optimized recoveries using a 96 hour leach time:


Phase 3 Metallurgical Testing - Gold Recoveries versus Metallurgical Process
                          (96 hour retention time)
  -----------------------------------------------------------------------
                                         Clusters and Zones
                           ----------------------------------------------
                               North Cluster           South Cluster
  -----------------------------------------------------------------------
  Metallurgical Process     Parallel    Fortune    Triangle   Plug No. 4
  -----------------------------------------------------------------------
  Process 1                     97.8%      96.6%       93.1%        87.6%
  -----------------------------------------------------------------------
  Process 2                     97.1%      95.6%       92.9%        83.2%
  -----------------------------------------------------------------------
  Process 3                     96.6%      97.1%       93.4%        85.1%
  -----------------------------------------------------------------------
  Process 4                     85.8%      82.0%       71.1%        58.4%
  -----------------------------------------------------------------------
Process 1 - Gravity concentration with CIL cyanide leach
Process 2 - Whole ore cyanide leach
Process 3 - Whole ore CIL cyanide leach
Process 4 - Flotation separation with cyanide leach of concentrate
(excluding leach of tails)

Summary of Phase 3 Metallurgical Testing

The metallurgical test program was completed by ALS on samples from the Lamaque deposits in Val-d'Or, Quebec on behalf of Integra, with supervision by WSP from Val-d'Or. The focus of this program was to test and compare four possible flowsheets, mirroring existing milling infrastructure in the region, on composites from four separate gold mineralized zones.

Four separate composites from the Parallel, Triangle, Fortune and No. 4 Plug zones were prepared from crushed drill core. The four composites were prepared to be at a median range of gold grade respective to each zone. Gold head assays were conducted using a screened metallic assaying method due to the coarse nugget effect of the gold in these deposits. The composites assayed 9.1, 8.8, 6.2 and 4.4 grams/tonne gold ("g/t Au") for the Parallel, Triangle, Fortune and No. 4 Plug composites, respectively.

Four flowsheets were tested on each sample. The first involved a gravity concentration followed by a Carbon-in-Leach ("CIL") cyanide leach of the gravity tails. The second was a whole ore cyanide leach and the third was a whole ore CIL. The fourth flowsheet involved a flotation separation (rougher and cleaner) followed by a separate cyanide leach of the flotation concentrate. Gold recoveries from the first three flowsheets were similar. Using these three flowsheets, and a 96 hour leach time, gold recoveries were as followed:


Parallel Zone Composite:                     96.6% to 97.8%
Triangle Zone Composite:                     92.9% to 93.4%
Fortune Zone Composite:                      95.6% to 97.1%
Plug No. 4 Zone Composite:                   83.2% to 87.6%

Using these same three flowsheets but with a 48 hour leach time, gold
recoveries were as followed:

Parallel Zone Composite:                     94.1% to 96.7%
Triangle Zone Composite:                     89.3% to 90.2%
Fortune Zone Composite:                      92.8% to 95.0%
Plug No. 4 Zone Composite:                   82.7% to 86.1%

The main difference between flowsheet performances was related to reagent consumption, with the CIL extractions consuming approximately twice as much sodium cyanide. In comparing the first three flowsheets, recovery differences were small enough that reagent consumptions and other economic factors relating to the use of the different processing facilities would likely be more significant than the metallurgical recovery differences.

The fourth flowsheet which involved gold recovery utilizing the flotation and cyanide leaching flowsheet produced significantly lower recoveries. This flowsheet, when not including the cyanide leach of the flotation tailings, had gold recovery substantially lower than the other flowsheets tested. Reagent consumptions for this flowsheet were also lower.

Testing Parameters

All flowsheets were tested with a primary grind sizing of 75um K80. Further testing with various grind sizes may be used in the future to further optimize test work.

The first flowsheet tested utilized a batch Knelson gravity concentrator with a hand panning of the gravity concentrate. Tailings from this gravity concentration underwent a 96 hour CIL cyanide test. The leaches were conducted at a pH of 11.0, with a sodium cyanide concentration of 1,000 ppm and with 30 grams per liter of carbon added to the leach slurry.

The second and third flowsheets were similar. The second flowsheet involved a 96 hour whole ore leach using 1,000 ppm sodium cyanide and a pH of 11.0. The third flowsheet used the same conditions as the second with the 96 hour leaches being CIL tests with 30 grams per liter of carbon added to the leach slurry.

The fourth flowsheet utilized flotation separation with a rougher separation followed by one stage of dilution cleaning. The flotation cleaner concentrate was subjected to a cyanide leach at 2,000 ppm sodium cyanide at pH of 11.0 for 96 hours. The flotation separations were conducted at natural pH with Potassium Amyl Xanthate (PAX) as a sulphide collector and Methyl Isobutyl Carbonyl (MIBC) as the frother.

No. 4 Plug Composites Future Testing

The No. 4 Plug composite has shown slightly lower overall gold recoveries when compared to material from other zones in all of the metallurgical processes tested. Before additional metallurgical testing is performed, and in order to fine-tune metallurgical recoveries for this zone, a mineralogical analysis of this ore type will be conducted. In previous testing work (see press release dated May 01, 2013 and July 25, 2013 on Phase 1 and 2 testing), finer grinding and more intense leach conditions had shown to optimize and improve performance significantly.

Project and Company Profile

Integra's Lamaque gold project is located in the heart of the Val-d'Or gold camp in the Province of Quebec, Canada, approximately 550 km northwest of Montreal. Quebec is rated one of the best mining jurisdictions in the world. Infrastructure, human resources and mining expertise are readily available.

The Company's primary objective is to continue to prove up additional resources while advancing the existing resource towards production. The project is divided into three main clusters of mineralization, the North, South and West Cluster. The North Cluster consists of the Parallel, Fortune, No. 5 Plug, and No. 3 Mine zones and is located approximately 1 km from the South Cluster, which includes the No. 4 Plug, Triangle and Triangle South zones. The Sixteen Zone and No. 6 Vein form the West Cluster.

Qualified Persons

The Lamaque exploration project is under the direct supervision of Herve Thiboutot, Eng. and Senior Vice-President of the company, and Francois Chabot, Eng. and Operations and Engineering Manager of the Company, both Qualified Person ("QP") as defined by National Instrument 43-101, and Alain-Jean Beauregard, P.Geo., Daniel Gaudreault, Eng., Geo. of Geologica Inc., and Michel Garon, Eng., M.A.Sc. of WSP Group in Val-d'Or, Quebec, all three independent QP as defined by National Instrument 43-101. The Company's QPs have reviewed the technical content of this release.

Quality Assurance - Quality Control ("QA/QC")

Thorough QA/QC protocols are followed on the project including insertion of duplicate, blank and standard samples in all drill holes. The core samples are submitted directly to ALS Laboratory Group and Bourlamaque Labs in Val-d'Or for preparation and analysis. Analysis is conducted on 1 assay-ton aliquots. Analysis of Au is performed using fire assay method with atomic absorption finish, with a gravimetric finish completed for samples exceeding 5 g/t Au, or a metallic sieve assay for samples containing visible gold. When available the gravimetric or metallic sieve assay results are used for the reported composite intervals.

ON BEHALF OF THE BOARD OF DIRECTORS

Stephen de Jong, CEO & President

Follow Integra Gold On:

- Twitter: http://twitter.com/integragoldcorp

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

Cautionary Note Regarding Forward Looking Statements:

No stock exchange, securities commission or other regulatory authority has approved or disapproved the information contained on this presentation. This presentation contains "forward-looking information" concerning Integra Gold Corp.'s ("Integra" or the "Company") future financial or operating performance and other statements that express management's expectations or estimates of future developments, circumstances or results. Generally, forward-looking information can be identified by the use of forward-looking terminology such as "seeks", "believes", "anticipates", "plans", "continues", "budget", "scheduled", "estimates", "expects", "forecasts", "intends", "projects", "predicts", "proposes", "potential", "targets" and variations of such words and phrases, or by statements that certain actions, events or results "may", "will", "could", "would", "should" or "might" "be taken", "occur" or "be achieved". Forward-looking statements included in this presentation include statements regarding potential mineralization and mineral resources, the proposed mining scenario for the South Lamaque Gold Project, including information with respect to the supporting infrastructure, the potential life of mine, rates of employment and the effects of steps taken to mitigate local impacts and the expected completion dates of exploration and drilling, exploration results, estimated and future exploration and administration expenditures, the completion of scoping studies, preliminary economic assessment, pre-feasibility or feasibility studies, and future plans and objectives of Integra. While all forward-looking statements involve various risks and uncertainties, these statements are based on certain assumptions that management of Integra believes are reasonable, including that it will be able to obtain financing and on reasonable terms, that its current exploration and other objectives can be achieved, that its exploration and other activities will proceed as expected, that its community and environmental impact procedures will work as anticipated, that general business and economic conditions will not change in a material adverse manner, that Integra will not experience any material accident, labour dispute or failure or shortage of equipment, and that all necessary government approvals for its planned exploration and potential development activities will be obtained in a timely manner and on acceptable terms.

There can be no assurance that the forward-looking statements will prove to be accurate and actual results and future events could differ materially from those anticipated in such statements. Important factors that could cause actual results to differ materially from the Integra's expectations include, among others, the actual results of current exploration activities being different than those anticipated by Integra, changes in project parameters as plans continue to be refined, changes in estimated mineral resources, future prices of metals, increased costs of labor, equipment or materials, availability of equipment, failure of equipment to operate as anticipated, accidents, effects of weather and other natural phenomena, risks related to community relations and activities of stakeholders, and delays in obtaining governmental approvals or financing. Although Integra has attempted to identify important factors that could cause actual results to differ materially, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Integra does not intend, and expressly disclaims any intention or obligation to, update or revise any forward-looking statements whether as a result of new information, future events or otherwise, except as required by law.

More Stories By Marketwired .

Copyright © 2009 Marketwired. All rights reserved. All the news releases provided by Marketwired are copyrighted. Any forms of copying other than an individual user's personal reference without express written permission is prohibited. Further distribution of these materials is strictly forbidden, including but not limited to, posting, emailing, faxing, archiving in a public database, redistributing via a computer network or in a printed form.

Latest Stories
More and more companies are looking to microservices as an architectural pattern for breaking apart applications into more manageable pieces so that agile teams can deliver new features quicker and more effectively. What this pattern has done more than anything to date is spark organizational transformations, setting the foundation for future application development. In practice, however, there are a number of considerations to make that go beyond simply “build, ship, and run,” which changes ho...
SYS-CON Events announced today that Niagara Networks will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Niagara Networks offers the highest port-density systems, and the most complete Next-Generation Network Visibility systems including Network Packet Brokers, Bypass Switches, and Network TAPs.
SYS-CON Events announced today that eCube Systems, a leading provider of middleware modernization, integration, and management solutions, will exhibit at @DevOpsSummit at 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. eCube Systems offers a family of middleware evolution products and services that maximize return on technology investment by leveraging existing technical equity to meet evolving business needs. ...
SYS-CON Events announced today that Commvault, a global leader in enterprise data protection and information management, has been named “Bronze Sponsor” of SYS-CON's 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Commvault is a leading provider of data protection and information management solutions, helping companies worldwide activate their data to drive more value and business insight and to transform moder...
Using new techniques of information modeling, indexing, and processing, new cloud-based systems can support cloud-based workloads previously not possible for high-throughput insurance, banking, and case-based applications. In his session at 18th Cloud Expo, John Newton, CTO, Founder and Chairman of Alfresco, described how to scale cloud-based content management repositories to store, manage, and retrieve billions of documents and related information with fast and linear scalability. He addres...
The many IoT deployments around the world are busy integrating smart devices and sensors into their enterprise IT infrastructures. Yet all of this technology – and there are an amazing number of choices – is of no use without the software to gather, communicate, and analyze the new data flows. Without software, there is no IT. In this power panel at @ThingsExpo, moderated by Conference Chair Roger Strukhoff, panelists will look at the protocols that communicate data and the emerging data analy...
Fifty billion connected devices and still no winning protocols standards. HTTP, WebSockets, MQTT, and CoAP seem to be leading in the IoT protocol race at the moment but many more protocols are getting introduced on a regular basis. Each protocol has its pros and cons depending on the nature of the communications. Does there really need to be only one protocol to rule them all? Of course not. In his session at @ThingsExpo, Chris Matthieu, co-founder and CTO of Octoblu, walk you through how Oct...
We’ve been doing it for years, decades for some. How many websites have you created accounts on? Your bank, your credit card companies, social media sites, hotels and travel sites, online shopping sites, and that’s just the start. We do it often without even thinking about it, quickly entering our personal information, our data, in a plethora of systems. Sometimes we’re not even aware of the information we are providing. It could be very personal information (think of the security questions you ...
Digital innovation is the next big wave of business transformation based on digital technologies of which IoT and Big Data are key components, For example: Business boundary innovation is a challenge to excavate third-party business value using IoT and BigData, like Nest Business structure innovation may propose re-building business structure from scratch, as Uber does in the taxicab industry The social model innovation is also a big challenge to the new social architecture with the design fr...
Complete Internet of Things (IoT) embedded device security is not just about the device but involves the entire product’s identity, data and control integrity, and services traversing the cloud. A device can no longer be looked at as an island; it is a part of a system. In fact, given the cross-domain interactions enabled by IoT it could be a part of many systems. Also, depending on where the device is deployed, for example, in the office building versus a factory floor or oil field, security ha...
Is your aging software platform suffering from technical debt while the market changes and demands new solutions at a faster clip? It’s a bold move, but you might consider walking away from your core platform and starting fresh. ReadyTalk did exactly that. In his General Session at 19th Cloud Expo, Michael Chambliss, Head of Engineering at ReadyTalk, will discuss why and how ReadyTalk diverted from healthy revenue and over a decade of audio conferencing product development to start an innovati...
All clouds are not equal. To succeed in a DevOps context, organizations should plan to develop/deploy apps across a choice of on-premise and public clouds simultaneously depending on the business needs. This is where the concept of the Lean Cloud comes in - resting on the idea that you often need to relocate your app modules over their life cycles for both innovation and operational efficiency in the cloud. In his session at @DevOpsSummit at19th Cloud Expo, Valentin (Val) Bercovici, CTO of So...
Data is an unusual currency; it is not restricted by the same transactional limitations as money or people. In fact, the more that you leverage your data across multiple business use cases, the more valuable it becomes to the organization. And the same can be said about the organization’s analytics. In his session at 19th Cloud Expo, Bill Schmarzo, CTO for the Big Data Practice at EMC, will introduce a methodology for capturing, enriching and sharing data (and analytics) across the organizati...
SYS-CON Events announced today that Tintri Inc., a leading producer of VM-aware storage (VAS) for virtualization and cloud environments, will exhibit at the 19th International Cloud Expo, which will take place on November 1–3, 2016, at the Santa Clara Convention Center in Santa Clara, CA. Tintri VM-aware storage is the simplest for virtualized applications and cloud. Organizations including GE, Toyota, United Healthcare, NASA and 6 of the Fortune 15 have said “No to LUNs.” With Tintri they mana...
There is little doubt that Big Data solutions will have an increasing role in the Enterprise IT mainstream over time. Big Data at Cloud Expo - to be held November 1-3, 2016, at the Santa Clara Convention Center in Santa Clara, CA - has announced its Call for Papers is open. Cloud computing is being adopted in one form or another by 94% of enterprises today. Tens of billions of new devices are being connected to The Internet of Things. And Big Data is driving this bus. An exponential increase is...